Adding a featured map to influencers who already have featured maps added adds extra unrelated maps

[Reletr]

Description
When adding featured beatmaps to beatmappers who already have featured beatmaps on your profile, extra unrelated beatmaps will also be added under them.

Reproduction

1. Have a mapper on your profile who has some featured beatmaps, and who beatmaps can still be added to.
2. Add 1 beatmap. Adding more than 1 does not seem to trigger this bug.
3. 1~2 extra beatmaps are also added, despite not being picked nor being related to the mapper at all. This can end up exceeding the limit of 5 maps normally possible

Expected behavior
Only the beatmap which you've picked should be added.

Screenshots

map selected was https://osu.ppy.sh/beatmapsets/2304921#osu/4927533
incorrect maps additionally added were https://osu.ppy.sh/beatmapsets/1008243#taiko/2110157 and https://osu.ppy.sh/beatmapsets/980615#mania/2052232

map selected was https://osu.ppy.sh/beatmapsets/2298213#osu/4909666
incorrect maps additionally added were https://osu.ppy.sh/beatmapsets/1047341#osu/2189250 and https://osu.ppy.sh/beatmapsets/829618#mania/1738121

Desktop (please complete the following information):

• OS: Windows 11
• Browser: Firefox Ver. 134.0